Journal articles: 'Winding machines Computer programs'

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Skinner, Michael L., Ronald R. Roser, and Kirk J. Samowitz. "Computer Control of Fiber Glass Filament Winding Machines." IEEE Transactions on Industry Applications IA-21, no. 4 (July 1985): 1057–63. http://dx.doi.org/10.1109/tia.1985.349578.

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Hultman, Erik. "Introducing Robotized Stator Cable Winding to Rotating Electric Machines." Machines 10, no. 8 (August 15, 2022): 695. http://dx.doi.org/10.3390/machines10080695.

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Following environmental concerns and the rapid digitalization of our society, we are currently experiencing an extensive electrification and industrial revolution. High numbers of electric machines thus need to be assembled for varying applications, including vehicle propulsion and renewable energy conversion. Cable winding is an alternative stator winding technology for electric machines that has been utilized for such applications, so far in smaller series or in prototype machines. The presented work introduces the first concept for automated stator cable winding of rotating electric machines. This concept could enable higher production volumes of cable wound machines and a unique flexibility in handling different machines, in line with Industry 4.0. Robotized stator cable winding is evaluated here for five very different rotating machine designs, through simulations and analytical extrapolation of previous experimental winding results. Potential cycle time and assembly cost savings are indicated compared to manual and lower volume conventional automation, while it is not possible to compete in the present form with existing very high-volume conventional winding automation for smaller machines. Future experimental work is pointed out on handling larger winding cables and special machine designs, and on increased robustness and optimization.

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Jumayev, Sultan, Aleksandar Borisavljevic, Konstantin Boynov, Juha Pyrhönen, and Elena A. Lomonova. "Inductance calculation of high-speed slotless permanent magnet machines." COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 34, no. 2 (March 2, 2015): 413–27. http://dx.doi.org/10.1108/compel-08-2014-0207.

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Purpose – The purpose of this paper is to give a simple, fast and universal inductance calculation approach of slotless-winding machines and comparison of inductances of toroidal, concentrated and helical-winding machines, since these winding types are widely used among low-power PM machines. Design/methodology/approach – Harmonic modeling approach is applied to model the magnetic field of the windings in order to calculate the synchronous inductances. The method is based on distinction between electromagnetic properties of different regions in the machine where each region is represented by its own governing equation describing the magnetic field. The governing equations are obtained from Maxwell’s equations by introducing vector potential in order to simplify the calculations. Findings – Results of the inductances of toroidal, concentrated and helical-winding slotless PM machines, which have the same torque and dimensions, obtained by the proposed analytical method are in good agreement with 3D FEM, where the relative difference is smaller than 15 percent. However, the calculation time of the analytical method is significantly less than in 3D FEM: seconds vs hours. Additionally, from the results it is concluded that the toroidal-winding machine has the highest inductance and DC resistance values among considered machines. Helical-winding machine has lowest inductance and DC resistance values. Inductance of concentrated-winding machine is between inductance of helical and toroidal windings; however, DC resistance of the concentrated windings is comparable with resistance toroidal windings. Originality/value – In this paper the inductance calculation based on harmonic modeling approach is extended for toroidal and helical-winding machines which makes the method applicable for most of the slotless machine types.

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Silwal, Bishal, and Peter Sergeant. "Thermally Induced Mechanical Stress in the Stator Windings of Electrical Machines." Energies 11, no. 8 (August 14, 2018): 2113. http://dx.doi.org/10.3390/en11082113.

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The lifetime of an electrical machine mainly depends on the thermal overloading. Modern day applications of electrical machines on one hand require compact machines with high power density, while on the other hand force electrical machines to undergo frequent temperature cycling. Until recently, in the case of electrical machines, the main factor related to the degradation of the winding insulation was thought to be the thermal oxidization of the insulation materials. It has now been revealed that thermal overloading can also induce mechanical stress in the windings of electrical machines, which over time could lead to fatigue and degradation. In this paper, a comprehensive study of the thermally induced mechanical stress in the windings of an electrical machine is presented. The study is performed using combined thermo-mechanical models. The numerical results are validated by experiments on a segmented stator winding set-up.

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Slunjski, Marko, Obrad Dordevic, Martin Jones, and Emil Levi. "Symmetrical/Asymmetrical Winding Reconfiguration in Multiphase Machines." IEEE Access 8 (2020): 12835–44. http://dx.doi.org/10.1109/access.2020.2965652.

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Yan, Liang, Lei Zhang, Zongxia Jiao, Hongjie Hu, Chin-Yin Chen, and I.-Ming Chen. "A tubular linear machine with dual Halbach array." Engineering Computations 31, no. 2 (February 25, 2014): 177–200. http://dx.doi.org/10.1108/ec-01-2013-0022.

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Purpose – Force output is extremely important for electromagnetic linear machines. The purpose of this study is to explore new permanent magnet (PM) array and winding patterns to increase the magnetic flux density and thus to improve the force output of electromagnetic tubular linear machines. Design/methodology/approach – Based on investigations on various PM patterns, a novel dual Halbach PM array is proposed in this paper to increase the radial component of flux density in three-dimensional machine space, which in turn can increase the force output of tubular linear machine significantly. The force outputs and force ripples for different winding patterns are formulated and analyzed, to select optimized structure parameters. Findings – The proposed dual Halbach array can increase the radial component of flux density and force output of tubular linear machines effectively. It also helps to decrease the axial component of flux density and thus to reduce the deformation and vibration of machines. By using analytical force models, the influence of winding patterns and structure parameters on the machine force output and force ripples can be analyzed. As a result, one set of optimized structure parameters are selected for the design of electromagnetic tubular linear machines. Originality/value – The proposed dual Halbach array and winding patterns are effective ways to improve the linear machine performance. It can also be implemented into rotary machines. The analyzing and design methods could be extended into the development of other electromagnetic machines.

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Jurkovic, Sinisa, and Elias G. Strangas. "Comparison of PMAC Machines for Starter-Generator Application in a Series Hybrid-Electric Bus." International Journal of Vehicular Technology 2011 (April 6, 2011): 1–11. http://dx.doi.org/10.1155/2011/275785.

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This paper presents a comparative study of outer rotor PMAC machine candidates for starter-generator application in hybrid bus with series power train configuration. PMAC machines with interior and surface mount permanent magnets are considered and compared, although a complete analysis is only carried out for the SPM. Different design aspects such as concentrated versus distributed windings as well as interior and exterior rotor structures are evaluated. Different slot numbers per pole per phase configurations for concentrated winding PMAC machines are also examined. Comparison and evaluation of the machines is based on their performance which included evaluation of winding and iron losses, magnet losses, and maximum torque capability as well as the size and weight of the machines.

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Bukhari, Syed Sabir Hussain, Ghulam Jawad Sirewal, Faheem Akhtar Chachar, and Jong-Suk Ro. "Dual-Inverter-Controlled Brushless Operation of Wound Rotor Synchronous Machines Based on an Open-Winding Pattern." Energies 13, no. 9 (May 2, 2020): 2205. http://dx.doi.org/10.3390/en13092205.

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In an open-winding machine, three-phase stator currents can be controlled such that the input armature currents may contain the third-harmonic current component in addition to the fundamental. Considering this attribute of open-winding patterns, a harmonic current field excitation technique for a wound rotor synchronous machine (WRSM) is proposed in this paper based on the control of time-harmonic magneto-motive force. Two inverters connected to both terminals of the stator winding are controlled so that the input armature current generates an additional third-harmonic current component. This third-harmonic component generates a vibrating magnetic field that induces a current in the specially designed rotor harmonic winding. The current is supplied as DC current to the rotor excitation winding to generate a rotor field by using a full-bridge diode rectifier in order to achieve brushless operation. The proposed dual-inverter-controlled brushless operation for a WRSM is executed in ANSYS Maxwell using 2-D finite element analysis to validate its operation and electromagnetic performance.

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Jang, Daekyu, and Junghwan Chang. "Design and Analysis of Surface-Mounted PM Vernier Machines Considering Harmonic Characteristics of Winding MMF." Energies 12, no. 5 (March 7, 2019): 897. http://dx.doi.org/10.3390/en12050897.

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This paper proposes a design method for the flux modulation poles (FMPs) formed on the stator of surface-mounted permanent magnet vernier machines (SPMVM) considering the winding configurations. In three types of the SPMVM with the different winding configurations, the FMP shapes to maximize the output torque are optimized by employing the analytical equations for the magneto-motive force (MMF) due to the windings, permeance, and flux density in the air-gap. Then, the validity of the optimal shapes for the FMPs is verified by the finite element analysis. It is found that the optimal FMP shapes are designed differently in the three types of the SPMVM and increase the output torque by different ratios according to the winding configurations. In addition, the experimental results for the prototype show that the proposed method can optimally design the FMP shape by analyzing mathematically the effects of the winding configuration and the FMP shape on the output torque of the SPMVM.

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Pietrowski, Wojciech, and Konrad Górny. "Analysis of Torque Ripples of an Induction Motor Taking into Account a Inter-Turn Short-Circuit in a Stator Winding." Energies 13, no. 14 (July 14, 2020): 3626. http://dx.doi.org/10.3390/en13143626.

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Despite the increasing popularity of permanent magnet synchronous machines, induction motors (IM) are still the most frequently used electrical machines in commercial applications. Ensuring a failure-free operation of IM motivates research aimed at the development of effective methods of monitoring and diagnostic of electrical machines. The presented paper deals with diagnostics of an IM with failure of an inter-turn short-circuit in a stator winding. As this type of failure commonly does not lead immediately to exclusion of a drive system, an early stage diagnosis of inter-turn short-circuit enables preventive maintenance and reduce the costs of a whole drive system failure. In the proposed approach, the early diagnostics of IM with the inter-turn short-circuit is based on the analysis of an electromagnetic torque waveform. The research is based on an elaborated numerical field–circuit model of IM. In the presented model, the inter-turn short-circuit in the selected winding has been accounted for. As the short-circuit between the turns can occur in different locations in coils of winding, computations were carried out for various quantity of shorted turns in the winding. The performed analysis of impact of inter-turn short-circuit on torque waveforms allowed to find the correlation between the quantity of shorted turns and torque ripple level. This correlation can be used as input into the first layer of an artificial neural network in early and noninvasive diagnostics of drive systems.

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Neumüller, Heinz Werner, G. Klaus, and W. Nick. "Status and Prospects of HTS Synchronous Machines." Advances in Science and Technology 47 (October 2006): 228–37. http://dx.doi.org/10.4028/www.scientific.net/ast.47.228.

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Up to now most of the efforts for developing HTS technology have been directed to devices for grid applications. However, HTS synchronous machines as motors and generators become more and more interesting within the world-wide development programs. Replacing the copper winding of the rotor by an HTS one and introducing an iron-less aircore stator winding the very compact HTS machine has less than half the weight and volume, higher efficiency and an excellent operational behavior when compared to the conventional devices. These features make HTS rotating machines very attractive for e.g. ship drives and industrial applications for the processing industry and power generation in power plants and wind parks. World-wide, HTS machines have already demonstrated their advantages and technical feasibility. The prototypes are ranging from the 5 MW low-speed high-torque propulsion motor to the high-speed 3600 rpm 4 MVA HTS generator. Feasibility studies clearly show the financial benefits when introducing high-efficient HTS wire based rotors into a large scale power generator systems. At present, most of the industry driven activities take place in the United States, Germany, Japan and Korea and are mainly directed towards applications aboard ships. Further potential applications as well as the technical and economic benefits will be discussed.

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Selema, Ahmed, Mohamed N. Ibrahim, and Peter Sergeant. "Electrical Machines Winding Technology: Latest Advancements for Transportation Electrification." Machines 10, no. 7 (July 12, 2022): 563. http://dx.doi.org/10.3390/machines10070563.

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The ever-increasing demand for higher-power dense electrical machines has resulted in different electrical, mechanical, and thermal stresses, which can eventually cause machine failure. For this reason, the management of stresses and losses must be thoughtfully investigated to have a highly reliable electrical machine. The literature agrees that winding losses are the dominant loss mechanism in many electrical machines. However, statements vary on how to mitigate these losses along with the aforementioned stresses. To avoid winding failure, a study of the various winding topologies would allow for a better consideration of the challenges and limitations in the performance of different electrical machines. To this aim, this paper introduces a comprehensive review for different winding topologies. Many reported cases in the literature are summarized and compared. Moreover, the utilization of additive manufacturing (AM) in the production of the machine windings is presented, showing a high level of maturity of this emerging technology. Finally, different challenges facing the design of machine windings are introduced including the AC high frequency losses, thermal management, mechanical and acoustic problems, insulation aging, automated production, and winding manufacturability.

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Abdennadher, Imen, Ahmed Masmoudi, and Ahmed Elantably. "Concentrated winding PM machines: a pre‐design approach." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 27, no. 5 (September 12, 2008): 985–99. http://dx.doi.org/10.1108/03321640810890726.

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Dietz, Armin, Antonino Oscar Di Tommaso, Fabrizio Marignetti, Rosario Miceli, and Claudio Nevoloso. "Enhanced Flexible Algorithm for the Optimization of Slot Filling Factors in Electrical Machines." Energies 13, no. 5 (February 26, 2020): 1041. http://dx.doi.org/10.3390/en13051041.

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The continuous development in the field of industrial automation and electric mobility has led to the need for more efficient electrical machines with a high power density. The improvement of electrical machines’ slot filling factors is one of the measures to satisfy these requirements. In recent years, this topic has aroused greater interest in the industrial sector, since the evolution of the winding technological manufacturing processes allows an economically sustainable realization of ordered winding arrangements, rather than random ones. Moreover, the manufacture of electrical machines’ windings must be preceded by an accurate design phase in which it is possible to evaluate the maximum slot filling factor obtainable for a given wire shape and for its dimensions. For this purpose, this paper presents an algorithmic approach for the evaluation of maximum slot filling factors in electrical machines under an ideal geometric premise. In particular, this algorithm has a greater degree of flexibility with respect to the algorithm approaches found in the literature, since the study has been extended to round, rectangular and hexagonal wire sections. Furthermore, the slot filling factor calculation was carried out both for standard and non-standard slots. The algorithmic approach proposed can be considered as an additional useful tool for the fast design of electrical machine windings.

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Brkovic, Bogdan, and Milos Jecmenica. "Calculation of Rotor Harmonic Losses in Multiphase Induction Machines." Machines 10, no. 5 (May 20, 2022): 401. http://dx.doi.org/10.3390/machines10050401.

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The topic of this paper is the determination of rotor harmonic losses in multiphase machines. Specifically, harmonic losses occur in the rotor winding and core due to higher-order spatial harmonics of the flux density. This phenomenon influences machine parameters and overall performance and increases temperature rise in parts of the rotor. The flux density distribution is determined by the stator magnetomotive force harmonic content, which is directly related to the winding distribution. A cage-rotor asymmetrical six-phase induction machine is selected for this case study. An analysis of different stator winding topologies and their influence on harmonic losses is presented. A finite element-based method for calculating the contribution of individual stator magnetomotive force harmonics to the rotor losses is developed and described in the paper. The analysis includes scenarios with different phase current waveforms to emphasize the issues specific to the asymmetrical six-phase machine. It is found that the magnetomotive force components generated by non-torque-producing current components contribute significantly to harmonic losses. The obtained results can represent a foundation for optimal stator winding topology selection. This work is intended to motivate the development of new and the modification of existing models to properly include rotor harmonic losses during the design, performance prediction, and control of multiphase machines.

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Caruso, Massimo, Antonino Di Tommaso, Fabrizio Marignetti, Rosario Miceli, and Giuseppe Ricco Galluzzo. "A General Mathematical Formulation for Winding Layout Arrangement of Electrical Machines." Energies 11, no. 2 (February 17, 2018): 446. http://dx.doi.org/10.3390/en11020446.

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Borchardt, Norman, Ralf Hinzelmann, Dominik S. Pucula, Wolfgang Heinemann, and Roland Kasper. "Winding Machine for Automated Production of an Innovative Air-Gap Winding for Lightweight Electric Machines." IEEE/ASME Transactions on Mechatronics 21, no. 3 (June 2016): 1509–17. http://dx.doi.org/10.1109/tmech.2016.2532964.

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Choi, Jongwon, and Kwanghee Nam. "Wound Synchronous Machine Sensorless Control Based on Signal Injection into the Rotor Winding." Energies 11, no. 12 (November 24, 2018): 3278. http://dx.doi.org/10.3390/en11123278.

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A sensorless position scheme was developed for wound synchronous machines. The demodulation process is fundamentally the same as the conventional signal-injection method. The scheme is different from techniques for permanent-magnet synchronous machines, in that it injects a carrier signal into the field (rotor) winding. The relationship between the high-frequency current responses and the angle estimation error was derived with cross-coupling inductances. Furthermore, we develop a compensation method for the cross-coupling effect, and present several advantages of the proposed method in comparison with signal injection into the stator winding. This method is very robust against magnetic saturation because it does not depend on the saliency of the rotor. Furthermore, the proposed method does not need to check the polarity at a standstill. Experiments were performed to demonstrate the improvement in the compensation of cross-coupling, and the robustness against magnetic saturation with full-load operation.

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Ge, Jian, Wei Xu, Yi Liu, Fei Xiong, and Dayi Li. "Investigation on Winding Theory for Short Primary Linear Machines." IEEE Transactions on Vehicular Technology 70, no. 8 (August 2021): 7400–7412. http://dx.doi.org/10.1109/tvt.2021.3089780.

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Andreev, A. M., A. Sh Azizov, I. A. Andreev, A. N. Smirnov, A. A. Stepanov, and G. A. Nazarov. "Particularities of measuring partial discharges in stator windings insulation systems of high-voltage electrical machines." Safety and Reliability of Power Industry 14, no. 1 (May 4, 2021): 61–68. http://dx.doi.org/10.24223/1999-5555-2021-14-1-61-68.

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The purpose of the article is to provide potential tools that can make a significant contribution to the identification of partial discharges (PD). Different types of partial discharges occur in stator winding insulation and a few partial discharges may occur simultaneously. Internal partial discharges are electrical discharges that occur in voids in the insulation of the stator winding. In typical stator insulation systems that use epoxy bonded mica tapes, insulation degradation due to internal partial discharges is usually slow (many years or decades). External partial discharges (slot PD and surface PD in the end-winding) are more dangerous and lead to the destruction of the insulation in a short time (several months or years). Therefore, the identification of insulation defects is essential. The analysis of existing methods for identification of defects in the insulation of high-voltage electrical machines using the results of measuring the partial discharges characteristics is carried out. The advantages and disadvantages of each of the groups of identification methods are characterized. It is shown that among the models of knowledge representation in solving problems of diagnostics of insulation systems for high-voltage electrical machines, identification methods, including field tests using training samples, are among the most suitable ones. It is noted that detection of insulation defects and their identification cannot be carried out only by direct measurements of PD characteristics and other dielectric parameters (electrical resistance, dielectric loss, polarization index). For this, special computing programs based on pattern recognition methods should be used. Results are presented of identification of technological defects in the insulation of the stator winding at the stage of factory testing, obtained using the PD identification method developed by the authors

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Szucs, Aron, Zlatko Kolondzovski, Jan Westerlund, and Juha Vahala. "Diamond enriched lamination and winding insulation for electrical machines." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 38, no. 4 (July 1, 2019): 1245–52. http://dx.doi.org/10.1108/compel-10-2018-0397.

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Purpose The thermal management of electrical insulations poses a challenge in electrical devices as electrical insulators are also thermal insulators. Diamond is the best solid electrical insulator and thermal conductor. This can lead to a paradigm change for electrical machine winding and lamination insulation design and thermal management. The paper introduces these techniques and discusses its effect for the design of electrical machines and its potential consequences for electromagnetic analysis, for example, in multi-physics modelling. The diamond winding insulation is patent-pending, but the diamond enriched lamination insulation is published for the benefit of the scientific community. Design/methodology/approach The windings of electrical machines are insulated to avoid contact between the coil and other conductive components, for example, the stator core. The principle of using mica tape and resin impregnation has not changed for a century and is well established to produce main insulation on a complex conductor shape and size. These insulations have poor heat-conducting properties. Similarly, the insulation of laminated steel sheets comprising the stator and rotor restrict heat flow. Diamond-based insulation provides a new path. Increased thermal conductivity means reduced temperature rise and the reduced thermal time constants in multi-physics simulations and system analysis. Findings The largest benefit of a diamond-based core insulation is in electrical machines in which the losses are conducted axially to the coolant. These are machines with radial ducts and effective cooling in the end regions. The main benefit will be in reducing the number of radial ducts that positively affect the size, production costs and the copper losses of the machine. The increased thermal conductivity of the diamond insulation system will reduce the thermal constants noticeably. These will affect system behavior and the corresponding simulation methods. Originality/value Diamond insulation can lead to a paradigm change for electrical machine winding and lamination insulation design and thermal management. It might also lead to new modeling requirements in system analysis.

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Sun, Z., J. Wang, D. Howe, and G. W. Jewell. "An online winding fault detection technique for fault-tolerant PM machines." International Journal of Systems Science 40, no. 3 (March 2009): 289–96. http://dx.doi.org/10.1080/00207720802351035.

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Selema, Ahmed, Mohamed N. Ibrahim, and Peter Sergeant. "Mitigation of High-Frequency Eddy Current Losses in Hairpin Winding Machines." Machines 10, no. 5 (April 30, 2022): 328. http://dx.doi.org/10.3390/machines10050328.

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In high-speed and high-frequency electric machines, one of the major issues that impacts the performance and capability of a machine is the high-frequency eddy current losses in the windings. This work deals with AC winding losses in flat rectangular conductors. Aiming for eddy current loss mitigation, two different materials are investigated and compared for the same winding design, namely copper and aluminum. Using the finite element method (FEM), the conductor loss and current density behavior are simulated at the strand level. Further, in order to verify the simulated losses, the AC losses are measured and compared over a wide range of frequencies. Finally, recommendations are provided based on the obtained measurements to identify the best winding topology that is most suitable for automotive applications.

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Jedryczka, Cezary, Wojciech Szelag, and Zbigniew Jerry Piech. "Multiphase permanent magnet synchronous motors with fractional slot windings." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 35, no. 6 (November 7, 2016): 1937–48. http://dx.doi.org/10.1108/compel-03-2016-0120.

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Purpose The purpose of this paper is to investigate advantages of multiphase permanent magnet synchronous motors (PMSM) with fractional slot concentrated windings (FSCW). The investigation is based on comparative analysis and assessment of FSCW PMSM wound as 3, 6, 9 and 12 phase machines suited for low speed applications. Design/methodology/approach The investigations are focussed on distortions of back electromotive (emf) and magnetomotive force (mmf) with the torque ripples and motors’ performance taken into account. The finite element models with the aid of customized computer code have been adopted for motor winding design and back emf, mmf and motor performance analyses. Findings The novel multiphase winding layouts were found to offer lower content of sub-harmonics in the mmf waveforms compared with the traditional three-phase machine designs. Moreover, the investigated multiphase machines exhibited higher average value of the electromagnetic torque, while the multiphase PMSM machines with FSCW were further characterized by significantly lower torque pulsations. Originality/value The analyses presented in this paper demonstrate that PMSM with FSCW are advantageous to their counterpart three-phase machines. Specifically, they offer higher performance and are more suitable to work with multiple drives supplying segmented winding system. This ability of using multi-drive supply for one motor offers flexibility and cost reduction while increasing fault tolerant power train system.

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Stockbrügger, Jan Ole, and Bernd Ponick. "Analytical Determination of the Slot and the End-Winding Portion of the Winding-to-Rotor Capacitance for the Prediction of Shaft Voltage in Electrical Machines." Energies 14, no. 1 (December 31, 2020): 174. http://dx.doi.org/10.3390/en14010174.

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Common-mode voltage, caused by a 2-level inverter, is a source of discharge currents in motor bearings. Due to the capacitive coupling, between the stator winding and the rotor, an image of the common-mode voltage is produced on the shaft—which can exceed the dielectric strength of the lubrication film of motor bearings. Accurate determination of the winding-to-rotor capacitance is necessary to predict the shaft voltage. This article proposes a novel analytical determination of the slot and the end-winding portion of the winding-to-rotor capacitance. The calculation rules, which are based on the method of image charges and the charge simulation method, take into account the continuity and the boundary conditions of the field areas. Results are validated by means of finite element method simulations. Notably, deviations are in the single-digit percentage range. Furthermore, the presented methods are simple to implement.

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Tawfiq, Kotb B., Mohamed N. Ibrahim, Ayman M. EL-Refaie, and Peter Sergeant. "A Practical Approach to Identify the Phases Sequence in Five Phase Machines with Combined Star–Pentagon Configuration." Mathematics 10, no. 21 (November 2, 2022): 4086. http://dx.doi.org/10.3390/math10214086.

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Due to the significant advantages of a high torque density, better fault tolerance and high efficiency, the combined star–pentagon winding has recently gained researchers’ interest. In this paper, a simple method to identify the sequence of phases of a five-phase machine with combined star–pentagon winding was proposed. This was accomplished using resistance measurements between adjacent and non-adjacent phases. The analysis was conducted to clarify the phase sequence identification method. A case study of a 5.5 kW five-phase synchronous reluctance motor with combined star–pentagon winding was considered to simply apply the proposed method using an LCR meter for resistance measurements. The parasitic and wire resistances are dominant in the studied case, and this did not influence the accuracy of this method.

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SHCHERBAN, Volodymyr, Oksana KOLISKO, Marjana KOLISKO, Anton KIRICHENKO, and Yuryj SHCHERBAN. "SOFTWARE COMPONENTS IN COMPUTER DETERMINATION OF THREAD TENSION ON ROPING MACHINES USING RECURSION ALGORITHM." Herald of Khmelnytskyi National University 303, no. 6 (December 2021): 243–46. http://dx.doi.org/10.31891/2307-5732-2021-303-6-243-246.

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The development of software components for computer determination of thread tension on winding machines, in the preparation of the base using the recursion algorithm, allows at the initial stage to determine the technological loads that will occur during warping depending on the type of raw material, quality of spool preparation. Computer determination of the change in relative tension on dream machines in the preparation of the basis for the manufacture of multilayer technical fabrics for special purposes is based on the numerical solution of transcendental equations using recursion and dichotomy algorithms. Calculation of changes in relative tension on winding machines in the preparation of the basis for the manufacture of multilayer technical fabrics for special purposes allows at the initial stage to determine the technological loads that will occur during warping depending on the type of raw material, quality of spool preparation. The change of tension occurs due to the interaction of the warp threads with the guides of the winding machines of large and small curvature, tensioning devices. The development of software components in the computer determination of thread tension on spinning machines should be based on the use of object-oriented programming languages. Determining the change in relative tension in the refueling zones of the sweeping machine, taking into account the design of the unit for tension, will improve the technology of warping in the preparation of the basis for the manufacture of multilayer technical fabrics for special purposes. Improvement of technological processes of warping should be based on complex researches of process of interaction of warp threads with devices for a tension, directing surfaces of big and small curvature. Theoretical dependences of the warp tension will allow to obtain mathematical software used in a computer program to calculate the change in relative tension in the refueling zones of the spinning machine, reduce the percentage of breakage of warp threads, improve the quality of weaving thread. Many studies do not take into account the change in the input tension of the warp thread when it is wound from the spool. This leads to significant differences between the theoretical and experimental dependences of determining the change in relative tension in the refueling zones of the dream machine, which does not allow to obtain reliable results.

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Beladel, Abdelkader, Abdellah Kouzou, Mohamed Elbar, and Ahmed Hafaifa. "DTC Switching Strategy for Open-end Winding of Induction Machines Fed by a Dual-output Indirect Matrix Converter." Periodica Polytechnica Electrical Engineering and Computer Science 65, no. 3 (June 7, 2021): 186–95. http://dx.doi.org/10.3311/ppee.17597.

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This paper deals with the Direct Torque Control (DTC) of Dual Indirect Matrix Converter (DIMC) feeding an open-end winding three-phase Induction Motor (IM). Indeed, the open-end winding topology allows overcoming the main problem of Common-Mode Voltage (CMV) which is responsible of presence of stresses in the motor winding in classical topologies, controlling separately the winding of the three-phases, reducing the voltage stress of the power electronics switches and to decreasing the voltage and current harmonics in each phase. The proposed Dual-output Indirect Matrix Converter generates 18 active voltage space vectors. Whereas, in the proposed algorithm presented in this paper to ensure the control of the proposed topology it is implemented only with two null vectors and six active voltage vectors for each output. It is based on same idea of the space vector pulse width modulation that is applied separately for both converters to ensure the control of their output voltages. Indeed, to ensure the required voltage at each winding the output voltage of the first matrix converter are generated normally and output voltage of the second matrix converter are generated with 180° phase shift. The obtained simulation results prove clearly the overall performance of the control of the studied drive system based on the proposed topology and its control algorithm which may be extended to other drive system application, especially in industrial application where more improved performances are required.

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Wang, Aimeng, and Shanshan Li. "Investigation of E-Core Modular Permanent Magnet Wind Turbine." Energies 13, no. 7 (April 6, 2020): 1751. http://dx.doi.org/10.3390/en13071751.

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Under the adverse trend of fossil energy attenuation and air pollution, wind power effectively alleviates the global energy crisis and environmental pollution. For wind turbines, especially large offshore wind turbines, their transportation, installation, and maintenance are very inconvenient. In order to solve this problem, this paper presents an E-core stator modular machine which inserts stator gap into the unwounded teeth of the fractional-slot concentrated winding (FSCW) permanent magnet (PM) machine. The winding factor of the new stator structure machine was derived. The electromagnetic models of 12-slot/10-pole and 12-slot/14-pole modular FSCW PM machines and traditional FSCW PM machines were established using the finite element analysis (FEA) software, and the open-circuit flux density, cogging torque, load torque, loss, and efficiency were simulated and analyzed. The results showed that the modular structure of E-core stator not only simplified the transportation, installation, and maintenance of wind turbines, but also optimized the electromagnetic performance of the 12-slot/14-pole machine, i.e., improved the output torque and operation efficiency.

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Rosendahl, Jens, and Stefan Kulig. "Numerical field calculation of stator winding faults in synchronous machines." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 28, no. 6 (November 13, 2009): 1662–71. http://dx.doi.org/10.1108/03321640910999932.

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De Barros, Allan, and Ivan Chabu. "Modeling of airgap flux density for the study of stator core vibration in low speed synchronous machines." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 39, no. 4 (June 5, 2020): 839–52. http://dx.doi.org/10.1108/compel-01-2020-0012.

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Purpose This paper aims to develop models and simulations focused on the prediction of electromagnetic forces acting on the stator core of a synchronous machine. It contributes to the study of stator core vibrations. Design/methodology/approach An analytical model based on the rotating fields’ theory including the damper winding contribution was developed. Such model allows the comprehension of airgap magnetic field distribution and the consequent pressure distribution. Focus was given to the pressure sub-harmonics due to the usual fractional winding configuration of low speed machines. A comparative numerical model was also developed and applied to an example laboratory machine. Partial validation measurements were performed. Findings The paper provides the predicted electromagnetic forces and the relative influences of damper winding and teeth tangential forces on each pressure harmonic. It is shown by how much such effects can influence the amplitude of pressure sub-harmonics from a fractional stator winding. Research limitations/implications The performed validation measurements were based on the airgap field distribution, but the resulting core vibration at load was not measured. Therefore, researchers are encouraged to perform additional tests for improved validation. Practical implications The obtained models and results are of great importance for the design phase of new generators and for the diagnosis process of existing machines with core vibration problems. Originality/value As a contribution of this paper, the magnitude of indirect effect of tangential forces and the effect of damper winding are comparatively quantified for each pressure harmonic. The given approach contributes to the relative evaluation of these effects especially on the sub-harmonics from the fractional stator winding.

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Laksar, Jan, Lukáš Veg, and Roman Pechánek. "Challenges in Winding Design and Thermal Calculations: Physical Model of Permanent Magnet Synchronous Machine." Machines 9, no. 10 (October 13, 2021): 234. http://dx.doi.org/10.3390/machines9100234.

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Interest in multilayer windings is increasing with the application of the hairpin winding technology to the manufacturing of electrical machines. Therefore, the four-layer fractional slot concentrated winding is used for the initial design of the machine in this paper. The proposed physical model of the machine uses winding with a relatively high number of turns which is inappropriate to hairpin winding. Therefore the round-wire winding is created and the three-layer winding is derived and analyzed including the effect on the slot leakage inductance. The thermal analysis is then applied to the physical model of the machine to evaluate the slot-related thermal properties of the slot and the whole machine. The measurement is compared with the finite element analysis (FEA) and the equivalent slot thermal conductivity and heat transfer coefficients of the stator and rotor are obtained.

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Korkosz, M., P. Bogusz, J. Prokop, B. Pakla, and G. Podskarbi. "Comparative Analysis of Fault-Tolerant Dual-Channel BLDC and SR Motors." Energies 12, no. 13 (June 28, 2019): 2489. http://dx.doi.org/10.3390/en12132489.

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This article presents the results of a comparative analysis of two electronically commutated brushless direct current machines intended for fault-tolerant drives. Two machines designed by the authors were compared: a 12/14 dual-channel brushless direct current motor (DCBLDCM) with permanent magnets and a 12/8 dual-channel switched reluctance motor (DCSRM). Information is provided here on the winding configuration, the parameters, and the power converters of both machines. We developed mathematical models of the DCBLDCM and DCSRM which accounted for the nonlinearity of their magnetization characteristics in dual-channel operation (DCO) and single-channel operation (SCO) modes. The static torque characteristics and flux characteristics of both machines were compared for operation in DCO and SCO modes. The waveforms of the current and the electromagnetic torque are presented for DCO and SCO operating conditions. For DCO mode, an analysis of the behavior of both machines under fault conditions (i.e., asymmetrical control, shorted coil, and open phase) was performed. The two designs were compared, and their strengths and weaknesses were indicated.

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Narayanaswami, Chandrasekhar. "Superscalar RISC machines, straight-line programs, and graphics." Visual Computer 12, no. 3 (March 1, 1996): 117–31. http://dx.doi.org/10.1007/s003710050052.

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Narayanaswami, Chandrasekhar. "Superscalar RISC machines, straight-line programs, and graphics." Visual Computer 12, no. 3 (March 1996): 117–31. http://dx.doi.org/10.1007/bf01725100.

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Kreischer, Christian. "Modern methods to monitor end winding vibrations in turbo-generators." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 38, no. 4 (July 1, 2019): 1214–23. http://dx.doi.org/10.1108/compel-10-2018-0403.

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Purpose Problems caused by end winding vibrations in power plant generators have become increasingly evident in recent years and reveal a need for monitoring and diagnostic systems. An increasing number of operational outages are caused by failures of the winding insulation or the conductor itself due to end winding vibrations. Meanwhile, it is clear that the condition of the end winding must be continuously monitored during operation to detect ineffective end winding support in time and to plan the repair. Design/methodology/approach In this paper, the complex and nonlinear excitation mechanisms in large machines are presented and modern methods for vibration monitoring are described. Through a consistent use of vibration monitoring in the end winding area as well as the vibration diagnosis done by experts, damage mechanisms can be detected at an early stage, repair measures can be planned and serious damage owing to a weakened main insulation can be avoided. Findings By combining modal analysis and trend monitoring in relation to the learned vibration behaviour, the end winding condition can be assessed in a differentiated manner and changes in the end winding structure can be detected early. Originality/value Finally, an assessment for a two-pole, air-cooled turbo generator is proposed.

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Klein, Carsten, Mira Pinter, Marco Palmieri, Matthias Nienhaus, and Emanuele Grasso. "An Exact Solution to the Modified Winding Function for Eccentric Permanent Magnet Synchronous Machines." Mathematics 10, no. 3 (January 24, 2022): 345. http://dx.doi.org/10.3390/math10030345.

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The Winding Function Approach has been used since 1965 to describe the inductance behavior of small air-gap electrical machines, and several works have contributed to its formulation in the presence of mechanical faults, such as eccentricity, leading to the Modified Winding Function Approach (MWFA). In order to use the MWFA, an integral over a full rotation period needs to be computed. Nevertheless, this typically requires the performance of numerical integration, and thus it is affected by integration error, requires relatively high computational effort and, at the same time, it does not easily allow for performance of the analysis of the inductance harmonics. In this work, an exact analytical solution to the MWFA equation is provided in a form that allows to highlight the harmonic content of the inductances. After a thorough mathematical derivation of the solution, a numerical investigation is proposed for verification purposes.

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Ullah, Zia, and Jin Hur. "A Comprehensive Review of Winding Short Circuit Fault and Irreversible Demagnetization Fault Detection in PM Type Machines." Energies 11, no. 12 (November 27, 2018): 3309. http://dx.doi.org/10.3390/en11123309.

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Contemporary research has shown impetus in the diagnostics of permanent magnet (PM) type machines. The manufacturers are now more interested in building diagnostics features in the control algorithms of machines to make them more salable and reliable. A compact structure, exclusive high-power density, high torque density, and efficiency make the PM machine an attractive option to use in industrial applications. The impact of a harsh operational environment most often leads to faults in PM machines. The diagnosis and nipping of such faults at an early stage have appeared as the prime concern of manufacturers and end users. This paper reviews the recent advances in fault diagnosis techniques of the two most frequently occurring faults, namely inter-turn short fault (ITSF) and irreversible demagnetization fault (IDF). ITSF is associated with a short circuit in stator winding turns in the same phase of the machine, while IDF is associated with the weakening strength of the PM in the rotor. A detailed literature review of different categories of fault indexes and their strengths and weaknesses is presented. The research trends in the fault diagnosis and the shortcomings of available literature are discussed. Moreover, potential research directions and techniques applicable for possible solutions are also extensively suggested.

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EL‐Refaie, Ayman M., Z. Q. Zhu, Thomas M. Jahns, and David Howe. "Winding inductances of fractional slot surface‐mounted permanent magnet brushless machines." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 28, no. 6 (November 13, 2009): 1590–606. http://dx.doi.org/10.1108/03321640910999888.

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Novak-Marcincin, Jozef, and Ludmila Novakova-Marcincinova. "Advanced Techniques for NC Programs Preparation." Applied Mechanics and Materials 389 (August 2013): 726–29. http://dx.doi.org/10.4028/www.scientific.net/amm.389.726.

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Realization of the control programs for controlling of the numerically controlled (NC) manufacturing machines is very important in manufacturing practice in this time. Manufacturing process of the parts with complex and free form figures is realized by NC manufacturing machines application. It is very difficult without application of personal computers with special software. Very often this software can be Computer Aided Manufacturing (CAM) system. These programs for control of NC manufacturing machines can be realised by other methods, too. In paper is presented new method of NC programs preparation by Group Technology theory application.

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Kruchinina, Irina Yu, Yuvenaliy Khozikov, Alexandr Liubimtsev, and Valentina Paltceva. "Harmonic losses in high-speed PM synchronous machines." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 36, no. 3 (May 2, 2017): 683–91. http://dx.doi.org/10.1108/compel-09-2016-0401.

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Purpose The purpose of this paper is the development of a new numerical method for the calculation of the air-gap magnetic flux harmonics in synchronous machines with permanent magnet (PM) excitation. The harmonic analysis results are used as input data for the eddy-current loss calculation and for the rotor heating evaluation. Design/methodology/approach The method is based on the finite element analysis (FEA). The model takes into account toothed stator design, rotor asymmetrical magnetic reluctance and saturation. At first, a series of static DC magnetic (magnetostatic) simulations is run. Each problem corresponds to specific rotor position and the momentary stator winding currents. The Fourier analysis performed for each problem yields the harmonic spectrum variation in time. Then, a series of AC magnetic (time-harmonic) simulations is run. Each problem corresponds to a specific harmonic. The result is the eddy-current losses distribution. After total loss is calculated, the heat transfer analysis is conducted. Findings The analysis reveals that 90 per cent of losses are located in the sleeve that holds PMs together. Rotor eccentricity brings even harmonics of low magnitude that have little impact on heating. Originality/value In general, the study requires transient electromagnetic analysis with motion. The purposed method allows to simplify the problem. The method is based on static and quasi-static (time-harmonic) problems simulation. It is fast and highly automated. The method allows simultaneous taking into account of tooth-order harmonics, stator winding harmonics and eccentricity for heating calculation.

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Artetxe, Gurutz, Jesus Paredes, Borja Prieto, Miguel Martinez-Iturralde, and Ibon Elosegui. "Optimal Pole Number and Winding Designs for Low Speed–High Torque Synchronous Reluctance Machines." Energies 11, no. 1 (January 5, 2018): 128. http://dx.doi.org/10.3390/en11010128.

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Eladawi, A. E., E. S. Gadelmawla, I. M. Elewa, and A. A. Abdel-Shafy. "An application of computer vision for programming computer numerical control machines." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 217, no. 9 (September 1, 2003): 1315–24. http://dx.doi.org/10.1243/095440503322420241.

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Generation of the part programs, or tool paths, for products to be manufactured by computer numerical control (CNC) machines is very important. Many methods have been used to produce part programs, ranging from manual calculations to computer aided design/ manufacturing (CAD/CAM) systems. This work introduces a new technique for generating the part programs of existing products using the latest technology of computer vision. The proposed vision system is applicable for two-dimensional vertical milling CNC machines and is calibrated to produce both metric and imperial dimensions. Two steps are used to generate the part program. In the first step, the vision system is used to capture an image for the product to be manufactured. In the second step, the image is processed and analysed by software specially written for this purpose. The software CNCVision is fully written (in lab) using Microsoft Visual C++ 6.0. It is ready to run on any Windows environment. The CNCVision software processes the captured images and applies computer vision techniques to extract the product dimensions, then generates a suitable part program. All required information for the part program is calculated automatically, such as G-codes, X and Y coordinates of start-points and end-points, radii of arcs and circles and direction of arcs (clockwise or counterclockwise). The generated part program can be displayed on screen, saved to a file or sent to MS Word or MS Excel. In addition, the engineering drawing of the product can be displayed on screen or sent to AutoCAD as a drawing file.

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Dybkowski, Mateusz, and Szymon Antoni Bednarz. "Modified Rotor Flux Estimators for Stator-Fault-Tolerant Vector Controlled Induction Motor Drives." Energies 12, no. 17 (August 22, 2019): 3232. http://dx.doi.org/10.3390/en12173232.

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This paper deals with fault-tolerant control (FTC) of an induction motor (IM) drive. An inter-turn short circuit (ITSC) of the stator windings was taken into consideration, which is one of the most common internal faults of induction machines. The sensitivity of the classic, well-known voltage and current models to the stator winding faults was analyzed. It has been shown that these classical state variable estimators are sensitive to induction motor parameter changes during stator winding failure, which results in unstable operation of the direct field-oriented control (DFOC) drive. From a safety-critical applications point of view, it is vital to guarantee stable operation of the drive even during faults of the machine. Therefore, a new FTC system has been proposed, which consists of new modified rotor flux estimators, robust to stator winding faults. A detailed description of the proposed system is presented herein, as well as the results of simulation and experimental tests. Simulation analyses were performed using MATLAB/Simulink software. Experimental tests were carried out on the experimental test bench with a dSpace DS1103 card. The proposed solution could be applied as an alternative rotor flux estimation technique for the modern FTC drive.

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Wang, Shanming, Yonghong Xia, Shaogang Huang, Arui Qiu, and Xiangheng Wang. "Research on new hybrid excitation PM synchronous generators with tooth harmonic excitation." COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 33, no. 5 (August 26, 2014): 1613–24. http://dx.doi.org/10.1108/compel-11-2013-0345.

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Purpose – In order to keep the advantages of PM generators and eliminate its disadvantage – difficulty in regulating the magnetic field, hybrid excitation is an effective way. The purpose of this paper is to propose a novel way to achieve hybrid excitation by use of tooth harmonic field. Design/methodology/approach – Unlike weakening the tooth harmonics field and EMF in traditional machines, in this paper the tooth harmonics field is proposed to form a novel hybrid excitation permanent magnet synchronous generator (HEPMSG). Findings – The generation mechanism of tooth harmonic electromotive force (EMF) of rotor winding is introduced, and its influencing factors are discussed in detail. The matching design of tooth harmonic winding and field winding for maximum output field current of tooth harmonic excitation system is analyzed. Practical implications – This machine can achieve not only effective adjustment of the air-gap magnetic field, but also elimination of the brushes and slip rings. Originality/value – Unlike weakening the tooth harmonics field and EMF in traditional machines, in this paper the tooth harmonics filed is proposed to form a novel hybrid excitation PM synchronous generator. This machine can achieve not only effective adjustment of the air-gap magnetic field, but also elimination of the brushes and slip rings.

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Rebollo, Emilio, Carlos A. Platero, David Talavera, and Ricardo Granizo. "Use of Discharge Resistor to Improve Transient De-Excitation in Brushless Synchronous Machines." Energies 12, no. 13 (July 1, 2019): 2528. http://dx.doi.org/10.3390/en12132528.

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The discharge resistor is only used in case of electrical trip to reduce the field current as fast as possible and to minimize the damages produced by the short-circuit current supplied by the synchronous machine. The connection of the discharge resistor is done by opening the field breaker and it implies a large negative voltage in the field winding. This negative voltage is limited to 80% of the winding insulation voltage. On the other hand, in case of a transient de-excitation, at the first moment, the automatic voltage regulator (AVR) reduces the field voltage to the minimum. In case of one-quadrant rectifier type AVR, the minimum voltage is zero and in case of two-quadrant rectifier AVR, the minimum voltage is close to the ceiling voltage with negative polarity. In both cases, the minimum voltages are much smaller than the negative voltage produced by the connection of the discharge resistor. This paper presents a new system that improves the transient de-excitation of synchronous machines using the discharge resistor by an additional static field breaker (SFB). The control of the static field breaker and consequently the connection and disconnection of the discharge resistor is done based on the output field voltage supplied by the AVR. This allows the exciter field current to be reduced in a faster way and continue with the normal operation of the machine after the transient. In this study, the correct operation of the additional static field breaker (SFB) has been validated by computer simulations and experimental test in a 15 MVA generator comprising a commercial one-quadrant rectifier AVR type obtaining excellent results.

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Bukhari, Syed Sabir Hussain, Fareed Hussain Mangi, Irfan Sami, Qasim Ali, and Jong-Suk Ro. "High-Harmonic Injection-Based Brushless Wound Field Synchronous Machine Topology." Mathematics 9, no. 15 (July 22, 2021): 1721. http://dx.doi.org/10.3390/math9151721.

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This paper discusses the design and analysis of a high-harmonic injection-based field excitation scheme for the brushless operation of wound field synchronous machines (WFSMs) in order to achieve a higher efficiency. The proposed scheme involves two inverters. One of these inverters provides the three-phase fundamental-harmonic current to the armature winding, whereas the second inverter injects the single-phase high-harmonic i.e., 6th harmonic current in this case, to the neutral-point of the Y-connected armature winding. The injection of the high-harmonic current in the armature winding develops the high-harmonic magnetomotive force (MMF) in the air gap of the machine beside the fundamental. The high-harmonic MMF induces the harmonic current in the excitation winding of the rotor, whereas the fundamental MMF develops the main armature field. The harmonic current is rectified to inject the direct current (DC) into the main rotor field winding. The main armature and rotor fields, when interacting with each other, produce torque. Finite element analysis (FEA) is carried out in order to develop a 4-pole 24-slot machine and investigate it using a 6th harmonic current injection for the rotor field excitation to both attain a brushless operation and analyze its electromagnetic performance. Later on, the performance of the proposed topology is compared with the typical brushless WFSM topology employing the 3rd harmonic current injection-based field excitation scheme.

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Rebbah, Redjem, Mohamed Yazid Kaikaa, and Loubna Boudjelida. "Hybrid winding function method for inductance analysis of a line start synchronous reluctance machine." International Journal of Electrical and Computer Engineering (IJECE) 12, no. 5 (October 1, 2022): 4841. http://dx.doi.org/10.11591/ijece.v12i5.pp4841-4851.

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In recent years, there has been renewed interest in line-start synchronous reluctance machines (LSSRMs) due to their simple construction, magnet-free rotor, and low cost. To improve control performance, design optimization, and fault diagnostic analysis of these machines, it requires accurate estimation of their electromagnetic characteristics using detailed and time-consuming finite element analyses (FEAs). In this paper, inductances and electromagnetic torque of the LSSRM were calculated using the combination of winding function analysis and conformal mapping instead of FEA. The hybrid approach can be applied to the prediction of motor behavior, taking into account all space harmonics of the air-gap permeance without any restriction on the rotor saliencies and topologies. The influence of the core saturation, stator slots, and rotor bars were also considered. The results obtained by simulations were compared with FEA in terms of accuracy and computational time.

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Caruso, Massimo, Antonino Oscar Di Tommaso, Fabrizio Marignetti, and Rosario Miceli. "A General Investigation on the Differential Leakage Factor for Symmetrical and Asymmetrical Multiphase Winding Design." Energies 13, no. 20 (October 16, 2020): 5414. http://dx.doi.org/10.3390/en13205414.

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This work provides an investigation based on a fast estimation of the degree of unbalance (D.U.%) and the differential leakage factor (σ0) of multiphase electrical machine windings. This analysis is carried out by exploring almost 5000 combinations in terms of number of slots, pole pairs, phases and layers. The variability of the leakage factor is examined for each condition, defining an optimal region for its minimization. As a result, an extended mapping is carried out for both the degree of unbalance and the leakage factor, providing a useful tool during the early design stage of winding configurations for multiphase electric machines, even with slight asymmetries. The results obtained from this investigation are validated through finite element analysis and demonstrate that the differential leakage factor can be significantly reduced by adopting winding configurations with slight asymmetries, which also represent a valuable alternative in the electrical machine design.

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Pietrowski, Wojciech. "Detection of time-varying inter-turn short-circuit in a squirrel cage induction machine by means of generalized regression neural network." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 36, no. 1 (January 3, 2017): 289–97. http://dx.doi.org/10.1108/compel-03-2016-0121.

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Purpose Diagnostics of electrical machines is a very important task. The purpose of this paper is the presentation of coupling three numerical techniques, a finite element analysis, a signal analysis and an artificial neural network, in diagnostics of electrical machines. The study focused on detection of a time-varying inter-turn short-circuit in a stator winding of induction motor. Design/methodology/approach A finite element method is widely used for the calculation of phase current waveforms of induction machines. In the presented results, a time-varying inter-turn short-circuit of stator winding has been taken into account in the elaborated field-circuit model of machine. One of the time-varying short-circuit symptoms is a time-varying resistance of shorted circuit and consequently the waveform of phase current. A general regression neural network (GRNN) has been elaborated to find a number of shorted turns on the basis of fast Fourier transform (FFT) of phase current. The input vector of GRNN has been built on the basis of the FFT of phase current waveform. The output vector has been built upon the values of resistance of shorted circuit for respective values of shorted turns. The performance of the GRNN was compared with that of the multilayer perceptron neural network. Findings The GRNN can contribute to better detection of the time-varying inter-turn short-circuit in stator winding than the multilayer perceptron neural network. Originality/value It is argued that the proposed method based on FFT of phase current and GRNN is capable to detect a time-varying inter-turn short-circuit. The GRNN can be used in a health monitoring system as an inference module.

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Journal articles on the topic 'Winding machines Computer programs'

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